"But, if it takes you $1.10 to make $1 and there's a clear path to efficiencies/economies of scale, then maybe you're on to something." I agree with everything

"But, if it takes you $1.10 to make $1 and there's a clear path to efficiencies/economies of scale, then maybe you're on to something." I agree with everything you've said, but the latter part of that sentence is easily overlooked when the money is flowing freely: there are a lot of big-name startups right now who sure seem to have business models that are the equivalent of selling dollars for 95 cents. You hear a lot of things that sound like "if only we can solve this NP-complete problem and/or ultra-efficiently operationalize labor-intensive tasks that have been the bane of much larger companies for decades, we'll print money!" If only... In particular, you can hand-deliver low-margin things (that people clearly want) and goose your revenue like crazy...but can you do it profitably in the long run? I'll bet you a Kozmo messenger bag that you can't. This is more of a problem in the valley than elsewhere. People so techno-utopian that they sometimes forget to ask basic questions of feasibility, because revenue growth. That said, I have no idea how you get to hundreds of millions of dollars in funding without someone taking a step back and saying: "hey, wait a second...are there unit economics here?" That's just nuts.